考虑这段代码：
<UserControl x:Class="MyApp.MyControl"
...
xmlns:local="clr-namespace:MyApp"
DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}">
<UserControl.Template>
<ControlTemplate>
<ControlTemplate.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="Red"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</ControlTemplate.Resources>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
...
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="brdBase" Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource MyStory}"/>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</UserControl.Template>
</UserControl>
上面的代码没有问题。现在，我想将关键帧值绑定到这个用户控件MyStory的 DP（命名），如下所示：SpecialColor
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
这会出错：
无法冻结此 Storyboard 时间线树以供跨线程使用。
可以使用后面的代码来做到这一点。但我怎样才能只在 XAML 中做到这一点？
代码隐藏辅助解决方案：
►<em>第 1 步：将MyStory故事板放入brdBase资源中。
<UserControl.Template>
<ControlTemplate>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
...
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="brdBase" Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource MyStory}"/>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</UserControl.Template>
错误： 找不到名为“MyStory”的资源。资源名称区分大小写。
►<em>第 2 步：消除属性并从后面的Trigger代码开始。IsMouseOverMyStory
<UserControl.Template>
<ControlTemplate>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black" MouseEnter="brdBase_MouseEnter">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
</Border>
</ControlTemplate>
</UserControl.Template>
C# 代码隐藏：
private void brdBase_MouseEnter(object sender, MouseEventArgs e)
{
Border grdRoot = (Border)this.Template.FindName("brdBase", this);
Storyboard story = grdRoot.Resources["MyStory"] as Storyboard;
story.Begin(this, this.Template);
}
►<em>第 3 步：解决方案已经完成，但第一次不起作用。幸运的是，有解决此问题的方法。ControlTemplate放入一个就足够了Style。
（我需要其他Trigger类型，EventTrigger并且必须用 . 包装UserControl元素ControlTemplate。）
更新：
关于使用的想法ObjectDataProvider失败了。
- ObjectDataProvider资源不能用于提供情节提要！！！错误报告是：
- XamlParseException：设置属性“System.Windows.Media.Animation.BeginStoryboard.Storyboard”引发异常。
- InnerException： “System.Windows.Data.ObjectDataProvider”不是属性“Storyboard”的有效值。
- AssociatedControl DP 始终为空。
这是代码：
<UserControl.Template>
<ControlTemplate>
<ControlTemplate.Resources>
<local:StoryboardFinder x:Key="StoryboardFinder1" AssociatedControl="{Binding ElementName=brdBase}"/>
<ObjectDataProvider x:Key="dataProvider" ObjectInstance="{StaticResource StoryboardFinder1}" MethodName="Finder">
<ObjectDataProvider.MethodParameters>
<sys:String>MyStory</sys:String>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</ControlTemplate.Resources>
<Border x:Name="brdBase" BorderThickness="1" BorderBrush="Cyan" Background="Black">
<Border.Resources>
<Storyboard x:Key="MyStory">
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="brdBase">
<SplineColorKeyFrame KeyTime="0:0:1" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:MyControl}}, Path=SpecialColor}"/>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
...
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="brdBase" Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource dataProvider}"/>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</UserControl.Template>
StoryboardFinder 类：
public class StoryboardFinder : DependencyObject
{
#region ________________________________________ AssociatedControl
public Control AssociatedControl
{
get { return (Control)GetValue(AssociatedControlProperty); }
set { SetValue(AssociatedControlProperty, value); }
}
public static readonly DependencyProperty AssociatedControlProperty =
DependencyProperty.Register("AssociatedControl",
typeof(Control),
typeof(StoryboardFinder),
new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.None));
#endregion
public Storyboard Finder(string resourceName)
{
//
// Associated control is always null :(
//
return new Storyboard();
}
}